package mobi.celton.treeshaker.builder;

import java.util.Iterator;
import org.eclipse.core.resources.ICommand;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

public class ToggleNatureAction implements IObjectActionDelegate
{

	private ISelection selection;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
	 */
	public void run(IAction action)
	{
		if(selection instanceof IStructuredSelection)
		{
			for(Iterator<?> it = ((IStructuredSelection)selection).iterator(); it.hasNext();)
			{
				Object element = it.next();
				IProject project = null;
				if(element instanceof IProject)
				{
					project = (IProject)element;
				}
				else if(element instanceof IAdaptable)
				{
					project = (IProject)((IAdaptable)element).getAdapter(IProject.class);
				}
				if(project != null)
				{
					toggleNature(project);
				}
			}
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action
	 * .IAction, org.eclipse.jface.viewers.ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection)
	{
		this.selection = selection;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.IObjectActionDelegate#setActivePart(org.eclipse.jface.
	 * action.IAction, org.eclipse.ui.IWorkbenchPart)
	 */
	public void setActivePart(IAction action, IWorkbenchPart targetPart)
	{}

	/**
	 * Toggles sample nature on a project
	 * 
	 * @param project
	 *            to have sample nature added or removed
	 */
	private void toggleNature(IProject project)
	{
		try
		{
			IProjectDescription description = project.getDescription();
			String[] natures = description.getNatureIds();

			for(int i = 0; i < natures.length; ++i)
			{
				if(Nature.NATURE_ID.equals(natures[i]))
				{
					// Remove the nature
					String[] newNatures = new String[natures.length - 1];
					System.arraycopy(natures, 0, newNatures, 0, i);
					System.arraycopy(natures, i + 1, newNatures, i, natures.length - i - 1);
					description.setNatureIds(newNatures);
					project.setDescription(description, null);
					return;
				}
			}

			// Add the nature
			String[] newNatures = new String[natures.length + 1];
			System.arraycopy(natures, 0, newNatures, 0, natures.length);
			newNatures[natures.length] = Nature.NATURE_ID;
			description.setNatureIds(newNatures);
			project.setDescription(description, null);
			
			description = project.getDescription();
			ICommand[] builders = description.getBuildSpec();
			for(int i = 0; i < builders.length;)
			{
				int newPos = getBuilderPosition(builders[i].getBuilderName());
				if(newPos == -1)
					return;
				
				if(newPos != i)
				{
					ICommand t = builders[i];
					builders[i] = builders[newPos];
					builders[newPos] = t;
				}
				else
					++i;
			}
			description.setBuildSpec(builders);
			project.setDescription(description, null);
			
		}
		catch(CoreException e)
		{}
	}

	private static String _builders[] =
		new String[]
		{
			"com.android.ide.eclipse.adt.ResourceManagerBuilder",
			"com.android.ide.eclipse.adt.PreCompilerBuilder",
			"org.scala-ide.sdt.core.scalabuilder",
			"mobi.celton.treeshaker.TreeshakerBuilder",
			"com.android.ide.eclipse.adt.ApkBuilder"
		};
	
	private static int getBuilderPosition(String builder)
	{
		for(int i = 0; i < _builders.length; ++i)
			if(builder.equals(_builders[i]))
				return i;
		
		return -1;
	}

}



/*
*/

